[0020]Embodiments of the present invention will now be described, by way of example only, with reference to the accompanying drawings.
[0021]FIG. 1 is a perspective view in accordance with a preferred embodiment of the present invention. The present invention discloses a stretch film dispenser with a lifting device. The lifting device is mounted to a stretch film dispenser 100. The stretch film dispenser 100 comprises a first seat 101 and a second seat 102. The lifting device is disposed between the first seat 101 and the second seat 102. The stretch film dispenser 100 further comprises a roller assembly 103 and a film mounting unit 104.
[0022]Referring to FIG. 2 and FIG. 3, a first operating unit 10 is connected to one end of the first seat 101. The first operating unit 10 is provided with a first through hole 11. A peripheral wall of the first through hole 11 is formed with a first accommodating recess 12. The first accommodating recess 12 is provided with a first elastic member 13. An elastic end of the first elastic member 13 leans against a first fixing member 14. An immovable end of the first fixing member 14 is formed with an annular first flange 141. The first flange 141 is biased by the first elastic member 13. A first positioning block 15 protrudes from the peripheral wall of the first through hole 11. An outer peripheral wall of the first operating unit 10 is formed with a first opening 16 corresponding in position to the first accommodating recess 12. The first opening 16 is in communication with the first through hole 11. The first opening 16 of the first operating unit 10 is provided with a first control member 17. The first control member 17 has an elliptical first perforation 171. The central axis of the first perforation 171 is parallel to the central axis of the first through hole 11. As shown in FIG. 4, the first control member 17 has a first limiting hole 172 corresponding to the first fixing member 14. The first flange 141 of the first fixing member 14 is blocked by the first limiting hole 172 of the first control member 17. A free end of the first fixing member 14 is inserted into the first perforation 171 of the first control member 17.
[0023]Referring to FIG. 5 and FIG. 6, a second operating unit 20 is connected to one end of the second seat 102. The second operating unit 20 is provided with a second through hole 21. A peripheral wall of the second through hole 21 is formed with a second accommodating recess 22. The second accommodating recess 22 is provided with a second elastic member 23. An elastic end of the second elastic member 23 leans against a second fixing member 24. An immovable end of the second fixing member 24 is formed with an annular second flange 241. The second flange 241 is biased by the second elastic member 23. A second positioning block 25 protrudes from the peripheral wall of the second through hole 21. The first positioning block 15 is parallel to the second positioning block 25. An outer peripheral wall of the second operating unit 20 is formed with a second opening 26 corresponding in position to the second accommodating recess 22. The second opening 26 is in communication with the second through hole 21. The second opening 26 of the second operating unit 20 is provided with a second control member 27. The second control member 27 has an elliptical second perforation 271. The central axis of the second perforation 271 is parallel to the central axis of the second through hole 21. As shown in FIG. 11, the second control member 27 has a second limiting hole 272 corresponding to the second fixing member 24. The second flange 241 of the second fixing member 24 is blocked by the second limiting hole 272 of the second control member 27. A free end of the second fixing member 24 is inserted into the second perforation 271 of the second control member 27.
[0024]An accommodating unit 30 has a first end 31 disposed in the first through hole 11 of the first operating unit 10 and a second end 32 disposed in the second through hole 21 of the second operating unit 20. Referring to FIG. 2, FIG. 3 and FIG. 4, the first end 31 of the accommodating unit 30 is formed with a first engaging notch 311 corresponding to the first positioning block 15 of the first through hole 11. The first engaging notch 311 is engaged with the first positioning block 15. The accommodating unit 30 is locked by a screw 33. The first end 31 has a first aperture 312 corresponding to the first limiting hole 172 of the first control member 17. The free end of the first fixing member 14 passes through the first aperture 312. Please refer to FIG. 5, FIG. 6, FIG. 10 and FIG. 11, the second end 32 of the accommodating unit 30 is formed with a second engaging notch 321 corresponding to the second positioning block 25 of the second through hole 21. The second engaging notch 321 is engaged with the second positioning block 25. The accommodating unit 30 is locked by a screw 33. In the embodiment, the accommodating unit 30 is a hollow tube. The accommodating unit 30 has a receiving hole 34 therein. The receiving hole 34 is provided with a telescopic rod 35. The length of the telescopic rod 35 is greater than the length of the accommodating unit 30. An outer peripheral wall of the telescopic rod 35 is formed with a groove 351 corresponding to the first positioning block 15 and the second positioning block 25 for limiting the telescopic rod 35. Please refer to FIG. 7. The telescopic rod 35 defines a first axis a and a second axis b. The first axis a and the second axis b are spaced apart from each other. The telescopic rod 35 is formed with a plurality of first positioning holes 352 that are arranged along the first axis a and equally spaced apart from each other, so that the first fixing member 14 passes through the first limiting hole 172 and is engaged in one of the plurality of first positioning holes 352 for positioning the telescopic rod 35. The telescopic rod 35 is formed with a plurality of second positioning holes 353 that are arranged along the second axis b and equally spaced apart from each other, so that the second fixing member 24 passes through the second limiting hole 272 and is engaged in one of the plurality of second positioning holes 353 for positioning the telescopic rod 35. Thereby, the telescopic rod 35 can be independently operated to extend upward or retract downwardly, which is a preferred embodiment of the present invention, but not limited thereto. The first positioning holes 352 and the second positioning holes 353 may be in different shapes to achieve the effect of not interfering with each other and independently controlling up and down movement.
[0025]Please refer to FIG. 8. When in use, a film roll 200 is first mounted to the film mounting unit 104 of the stretch film dispenser 100, and then the film of the film roll 200 is wound around the roller assembly 103, so that the stretch film dispenser 100 can be used for packing articles. When the user is in the normal position, one end of the film roll 200 is attached to an article, and then the user holds and pulls the accommodating unit 30 for performing the packing operation.
[0026]Referring to FIG. 9, when the user wants to adjust the telescopic rod 35 to extend upwardly, the first control member 17 is first pressed to push the first flange 141 of the first fixing member 14, so that the first fixing member 14 is disengaged from the first positioning hole 352 of the telescopic rod 35 to adjust the length of the telescopic rod 35. After the telescopic rod 35 is pulled upward for a predetermined length, the first control member 17 is released, and the first fixing member 14 is pushed by the elastic force of the first elastic member 13, and the free end of the first fixing member 14 is engaged in one of the plurality of first positioning holes 352 to position the telescopic rod 35. Thereby, the stretch film dispenser 100 can be lifted to be suitable for articles of different heights, and the user can hold the telescopic rod 35 for performing the packing operation, so that the packing operation is more smooth and convenient.
[0027]It should be noted that when the telescopic rod 35 is pulled upward, the groove 351 of the telescopic rod 35 is subjected to the first positioning block 15 so that the telescopic rod 35 does not rotate when being pulled. After the telescopic rod 35 is pulled upward for a predetermined length, the first control member 17 is released, and the first fixing member 14 is biased by the first elastic member 13, so that the first fixing member 14 is accurately engaged with one of the first positioning holes 352 for positioning the telescopic rod 35.
[0028]Referring to FIG. 10 and FIG. 11 in cooperation with FIG. 9, when the user wants to adjust the telescopic rod 35 to extend downwardly, the first control member 17 is first pressed to push the first fixing member 14, so that the first fixing member 14 is disengaged from the first positioning hole 352 of the telescopic rod 35, and then the telescopic rod 35 can be pulled downwardly. After that, the second control member 27 is pressed to push the second flange 241 of the second fixing member 24, so that the second fixing member 24 is disengaged from the second positioning hole 353 of the telescopic rod 35 to adjust the length of the telescopic rod 35. After the telescopic rod 35 is pulled downward for a predetermined length, the second control member 27 is released, and the second fixing member 24 is pushed by the second elastic member 23, and the free end of the second fixing member 24 is engaged in one of the plurality of second positioning holes 353 to position the telescopic rod 35. Thereby, the stretch film dispenser 100 can be lowered to be suitable for articles of different heights. The telescopic rod 35 has the effect of bidirectional telescopic adjustment.
[0029]It should be noted that when the telescopic rod 35 is pulled downward, the groove 351 of the telescopic rod 35 is subjected to the second positioning block 25 so that the telescopic rod 35 does not rotate when being pulled. After the telescopic rod 35 is pulled downward for a predetermined length, the second control member 27 is released, and the second fixing member 24 is biased by the second elastic member 23, so that the second fixing member 24 is accurately engaged with one of the second positioning holes 353 for positioning the telescopic rod 35.
[0030]It is worth mentioning that, referring to FIG. 4, the first perforation 171 of the first operating unit 10 is elliptical. When the accommodating unit 30 is inserted through the first perforation 171, there is a gap 173 to provide an operation space between the first control member 17 and the accommodating unit 30. When the first control member 17 is pressed, the first control member 17 pushes the first fixing member 14 and the first elastic member 13 to disengage the first fixing member 14 from the first positioning hole 352 of the telescopic rod 35, so that the telescopic rod 35 can be pulled upward. Referring to FIG. 7, the second perforation 271 of the second operating unit 20 is elliptical. When the accommodating unit 30 is inserted through the second perforation 271, there is a gap 273 to provide an operation space between the second control member 27 and the accommodating unit 30. When the second control member 27 is pressed, the second control member 27 pushes the second fixing member 24 and the second elastic member 23 to disengage the second fixing member 24 from the second positioning hole 353 of the telescopic rod 35, so that the telescopic rod 35 can be pulled downward.
[0031]Although particular embodiments of the present invention have been described in detail for purposes of illustration, various modifications and enhancements may be made without departing from the spirit and scope of the present invention. Accordingly, the present invention is not to be limited except as by the appended claims.
